Got it. The wording was "explodes on a 5 in addtion to a 6", so I was wondering if i missed where the dice usually explode on a 6.
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Basically they explode once, it's actually the first sentence of the actual rules: 1d6 system. On a roll of 6, roll the die a second time and add it to the total.
However the most recent version of the game (waiting for reviewing to end) does change the language on Energetic to not use the term exploding, and better resemble other rule descriptions.